Rank: Inspector (3rd year) Born: April 23, 1964 (Age 36) Relationship with Suhyun: Senior-junior (Senior) Traits: The only one capable of maintaining the police patrol cars. Appears to be a coffee addict. Appearance: Long black hair and yellow eyes. Dark circles are usually settled under his eyes (but he is quite handsome). Personality: Very lazy and sleeps a lot, but shows a cold, analytical side during investigations. Ability: Mechanic (He calls it 'Ttoutta' or 'Opening it up').

Rank: Inspector (7th year, Leader of the Mystery Investigation Team) Born: December 28, 1970 (Age 30) Relationship with Rader: Close older sister/younger brother bond. Symbol: Whale-shaped badge. Appearance: Brown bob cut with gray eyes (quite pretty). Personality: Cold and focused on work; this trait carries over into her investigations. Ability: Profiler (Crime scene reconstruction).

Rank: Inspector (3rd year) Species: White Rabbit Beastman Born: January 7, 1965 (Age 35) Relationship with Gakbyeol: Senior-junior (Junior) Appearance: Short black hair with carrot-colored eyes (quite handsome). Nicknames: Mouth Fighter, Princess of Terror (Mouth of Terror). Personality: Kind and gentle, but becomes 180 degrees different—cold and emotionless—during investigations and interrogations. Ability: Eloquence (The ability to distinguish truth from lies).

Rank: Detective (3rd year) Born: December 15, 1971 (Age 29) Relationship with Sleepground: Close older sister/younger brother bond (Younger brother). Traits: Carries a large demolition hammer named 'Justice'. He never rides in the patrol car, always opting for his dark red motorcycle. Ranked 1st in the physical fitness test. He is Guest's biological older brother. Appearance: Red hair styled in a 7:3 part (originally black but dyed), with red eyes and a slightly intimidating face (but quite handsome). Personality: Hot-blooded and proactive. Ability: Action Leader (Physical enhancement).

Rank: Detective (3rd year) Born: September 11, 1971 (Age 29) Relationship with Deokgae: Deokgae's mentor. Traits: Loves smoked duck and cookies very much. Appearance: Short brown hair with black eyes (quite handsome). Personality: Usually playful and enjoys teasing Deokgae, but becomes serious and focused during investigations. Ability: Encyclopedia (Limited to 3 uses).

Rank: Sergeant (5th year) Species: Dog Beastman (Golden Retriever) Born: December 14, 1973 (Age 27) Relationship with Gongryong: Gongryong's junior. Team Position: The youngest member of the team. Traits: A fan of the girl group S.O.S. Lives alone with his grandmother (his parents died in a fire). Appearance: Short brown hair with squinted eyes (white eyes when opened) (quite handsome). Personality: Often teased and a bit of a crybaby, but tries his best to remain expressionless and unemotional during investigations. Ability: Sixth Sense (Intuition, insight, sensitivity, extrasensory perception).